CODEWITHSUNDEEP
bash
Pradeep Chandran
Pradeep Chandran

Reputation: 337

How to add env key and values in a dictionary for bash script

I have two env variables 

SMTP_PASSWORD=SMTP_PASSWORD_KEY
MICROSCANNER_TOKEN=MICROSCANNER_TOKEN_KEY

I need to add this to a dict using bash

eg: arr["SMTP_PASSWORD"]=SMTP_PASSWORD_KEY

the key and value should be taken from env

Upvotes: 0

Views: 3035

Answers (2)

PassKit
PassKit

Reputation: 12581

Outside your script:

export SMTP_PASSWORD=mySMTPKey
export MICROSCANNER_TOKEN=myMicroscannerKey

Inside your script:

As individual variables:

#!/bin/bash
SMTP_PASSWORD=${SMTP_PASSWORD_KEY}
MICROSCANNER_TOKEN=${MICROSCANNER_TOKEN_KEY}

As a map (available in Bash 4):

#!/bin/bash
declare -A MYMAP 
MYMAP[SMTP_PASSWORD]=${SMTP_PASSWORD_KEY}
MYMAP[MICROSCANNER_TOKEN]=${MICROSCANNER_TOKEN_KEY}

To iterate over the external ENV and add key/value pairs:

#!/bin/bash
declare -A MYMAP
while IFS='=' read -r -d '' n v; do
    MYMAP[${n}]=${v}
done < <(env -0)

# display all variable key value pairs
for K in "${!MYMAP[@]}"; do 
    echo $K = ${MYMAP[$K]}; 
done

Given your last comment, not wanting to bring in all ENV vars, you could do something like:

#!/bin/bash
envArray=( SMTP_PASSWORD MICROSCANNER_TOKEN )

declare -A MYMAP
for k in "${envArray[@]}"; do
    MYMAP[$k]=${!k}
done

for K in "${!MYMAP[@]}"; do
    echo $K = ${MYMAP[$K]};
done

Upvotes: 3

chepner
chepner

Reputation: 531185

You need an associative array (supported in bash 4 or later).

declare -A arr

arr[SMTP_PASSWORD]=$SMTP_PASSWORD
arr[MICROSCANNER_TOKEN]=$MICROSCANNER_TOKEN

There is no preexisting associative array that automatically includes all existing environment variables as its keys.

Upvotes: 0

Related Questions